package com.rem.cloudalibaba.filter;

import com.alibaba.nacos.common.utils.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * 全局过滤器
 *
 * @author Rem
 * @date 2021-09-24
 */

//@Component
public class AuthGlobalFilter implements GlobalFilter, Ordered {

    /**
     * 完成判断逻辑
     *
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        String token = exchange.getRequest().getQueryParams().getFirst("token");
        if (StringUtils.isBlank(token) || !"remTok".equals(token)) {
            System.out.println("鉴权失败");
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //调用chain.filter继续向下游执行
        return chain.filter(exchange);
    }

    /**
     * 顺序,数值越小,优先级越高
     *
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
